Add a little type safety to DaemonicParserState

Summary: Otherwise it's too easy to obtain a cache for different type and get a runtime error (which I had during developement of another diff).

Reviewed By: styurin

shipit-source-id: d2a07b5bb7

Author: stepancheg

src/com/facebook/buck/parser/DaemonicParserState.java

@@ -382,7 +382,7 @@ LoadingCache<Cell, BuildFileTree> getBuildFileTrees() {
    * types with generics. Care should be taken to ensure that the correct class object is passed in.
    */
   @SuppressWarnings("unchecked")
-  public <T> PipelineNodeCache.Cache<BuildTarget, T> getOrCreateNodeCache(Class<?> cacheType) {
+  public <T> PipelineNodeCache.Cache<BuildTarget, T> getOrCreateNodeCache(Class<T> cacheType) {
     try {
       return (PipelineNodeCache.Cache<BuildTarget, T>) typedNodeCaches.get(cacheType);
     } catch (ExecutionException e) {

src/com/facebook/buck/parser/PerBuildStateFactoryWithConfigurableAttributes.java

@@ -18,6 +18,7 @@
 
 import com.facebook.buck.core.cell.Cell;
 import com.facebook.buck.core.config.BuckConfig;
+import com.facebook.buck.core.model.BuildTarget;
 import com.facebook.buck.core.model.impl.MultiPlatformTargetConfigurationTransformer;
 import com.facebook.buck.core.model.targetgraph.TargetNode;
 import com.facebook.buck.core.model.targetgraph.impl.TargetNodeFactory;
@@ -200,9 +201,14 @@ protected PerBuildState create(
         MoreExecutors.listeningDecorator(
             createExecutorService(rootCell.getBuckConfig(), "configured-pipeline"));
 
+    @SuppressWarnings("unchecked")
+    PipelineNodeCache.Cache<BuildTarget, TargetNode<?>> nodeCache =
+        daemonicParserState.getOrCreateNodeCache(
+            (Class<TargetNode<?>>) (Class<?>) TargetNode.class);
+
     ParsePipeline<TargetNode<?>> targetNodeParsePipeline =
         new RawTargetNodeToTargetNodeParsePipeline(
-            daemonicParserState.getOrCreateNodeCache(TargetNode.class),
+            nodeCache,
             configuredPipelineExecutor,
             rawTargetNodePipeline,
             eventBus,